CN202602290U - Current-limiting harmonic suppression device for low-voltage system - Google Patents
Current-limiting harmonic suppression device for low-voltage system Download PDFInfo
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- CN202602290U CN202602290U CN2012201867509U CN201220186750U CN202602290U CN 202602290 U CN202602290 U CN 202602290U CN 2012201867509 U CN2012201867509 U CN 2012201867509U CN 201220186750 U CN201220186750 U CN 201220186750U CN 202602290 U CN202602290 U CN 202602290U
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- iron core
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a current-limiting harmonic suppression device for a low-voltage system and belongs to the technical field of power electronic equipment application. The device comprises a rectifier, a three-phase filter reactor with an iron core and an air gap, and a compensating capacitor, wherein the reactor is connected in series with the compensating capacitor; the three-phase filter reactor with an iron core and an air gap comprises an iron core, a winding, a base plate, a seat type mounting rack and a three-phase wiring terminal strip; the base plate is arranged between the winding and the iron core; the iron core consists of a laminated iron core module and an insulating base plate, is integrally impregnated with vacuum pressure epoxy resin, is solidified and dried through a drying furnace and is fixed on the seat type mounting rack; the winding is copper foil or aluminum foil, an interlayer insulator is formed in the winding, and a lead of the winding is connected with the three-phase wiring terminal strip; and the interlayer insulator is made of insulating paper. The current-limiting harmonic suppression device has the characteristics of novel design, compact structure, high harmonic suppression capacity, low loss, high linearity, low noise, simple installation, convenient wiring and long service life.
Description
Technical field
The utility model relates to a kind of current limliting and the device that suppresses harmonic wave of the 0.4kV of being used for low-pressure system, belongs to power electronic equipment manufacturing and applied technical field.
Background technology
Electric energy is the very important factor of production as far as industry.Our target is how to use it effectively, reduces reactive current through PFC and helps saves energy.The existing power electronic equipment, as: drive unit, uninterrupted power supply; Electric ballast; A large amount of uses of nonlinear load such as computer and arc furnace, the non-linear current that is produced just affect electrical network and have increased the weight of its load with the mode of harmonic wave, cause the pollution to electrical network.And the electric capacity of PFC or power capacitor and power transformer have formed a resonant circuit, experience show to the self-resonant frequency of three-phase circuit generally 250 and 500Hz between, promptly the 5th time, the 7th time and the tenth first harmonic; To single-phase nonlinear load, its self-resonant frequency generally 150 and 250Hz between, promptly reach quintuple harmonics for the third time.And resonance can cause following adverse consequences: the overload of capacitor, the overload of transformer and transmission equipment be to measuring the interference with control system, to the interference resonance increase of computer and electric actuator, i.e. and harmonic wave amplification and cause voltage distortion.
Summary of the invention
The purpose of the utility model is the deficiency to above-mentioned prior art, and a kind of current limliting and the device that suppresses harmonic wave that is used for low-pressure system (0.4kV) is provided.This device is able to the various damages of avoiding above resonance phenomena to cause through series connection three-phase filter reactor in the circuit.
Be to realize above-mentioned purpose, the utility model adopts following technical proposals: a kind of current limliting and the device that suppresses harmonic wave that is used for low-pressure system comprises rectifier (7), has the three-phase filter reactor (8) and compensation condenser (9) of iron core and air-gap.Above-mentioned reactor (8) is connected with compensation condenser (9).The three-phase filter reactor (8) that wherein has iron core and air-gap comprises iron core (1), winding (2), backing plate (3), seat formula installing rack (4) and three-phase terminal row (5).Above-mentioned backing plate (3) is located between winding (2) and (1) unshakable in one's determination; Above-mentioned iron core (1) is made up of laminated core module and insulating pad, through vacuum pressure epoxy resin integral dipping, solidifies dried through drying oven again, and on the fixing present formula installing rack (4); Above-mentioned winding (2) adopts copper platinum or aluminium platinum, is provided with layer insulation therebetween, and its lead-in wire is connected with three-phase terminal row (5).Above-mentioned layer insulation adopts insulating paper to make.
The utility model may be tuned to below the minimum harmonic frequency by the series resonant circuit that reactor and compensation condenser constituted.The power of reactor can be defined as a percentages of condenser impedance according to fundamental current.Make the natural frequency of vibration of detuning system will be lower than minimum line harmonic frequency.For the harmonic wave that is higher than line frequency, detuning PFC system shows as pure perception like this, and for the line frequency of 50Hz, it is capacitive, thereby reactive power just is able to proofread and correct, and reaches that harmonic wave suppresses and the purpose of current limliting.
The utlity model has modern design, compact conformation, anti-harmonic wave ability is strong, loss is low, the linearity high (to avoid the choking-winding magnetic saturation), noise is low, installation is simple, easy-to-connect, the characteristics of long service life.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of reactor in the utility model.
Fig. 3 is the application sketch map of the utility model in electrical network.
Embodiment
Embodiment
See figures.1.and.2, a kind of current limliting that is used for low-pressure system and the device that suppresses harmonic wave comprise rectifier 7, have three-phase filter reactor 8 compensation condensers 9 of iron core and air-gap.Above-mentioned reactor 8 is connected with compensation condenser 9.The three-phase filter reactor 8 that wherein has iron core and air-gap comprises iron core 1, winding 2, backing plate 3, seat formula installing rack 4 and three-phase terminal row 5.Above-mentioned backing plate 3 is located between winding 2 and unshakable in one's determination 1; Above-mentioned unshakable in one's determination 1 is made up of laminated core module and insulating pad, through vacuum pressure epoxy resin integral dipping, solidifies dried through drying oven again, and on the fixing present formula installing rack 4; Above-mentioned winding 2 adopts copper platinum or aluminium platinum, is interval with insulating barrier, and its lead-in wire is connected with three-phase terminal row 5.Above-mentioned insulating barrier adopts insulating paper to make.
With reference to Fig. 3, the utility model is connected reactor 8 earlier with compensation condenser 9, and together inserts electrical network with rectifier 7 and be connected with the low-pressure end of transformer 6.
Its basic principle: the inductance of power factor correction capacitor and transformer and electrical network has constituted an antiresonant circuit, and under resonance frequency, the resonance impedance of this circuit may very high (theory unlimited be big).If any harmonic frequency that this resonance frequency produces near rectifier, then relevant harmonic current will be added on this high resonance impedance, and the voltage drop that is produced will cause very large harmonic current, and this will damage the power consumption equipment of factory.For fear of resonance, can a reactor be connected with compensation condenser.The series resonant circuit that is constituted may be tuned to below the minimum harmonic frequency.The power of reactor can be defined as a percentages of condenser impedance according to fundamental current.Such reactor protection capacitor group is also referred to as the humorous filter circuit of offset.The size of assimilation effect (filter grade) depends on the short-circuit impedance of electrical network and the residual impedance of the humorous filter circuit of offset (by the filter quality decision).The harmonic current that rectifier (frequency converter) produces can suitably be absorbed.Reference data (is main with the three-phase nonlinear load): 5 subharmonic I
5=0.23xI
17 subharmonic; I
7=0.12xI
111 subharmonic; I
11=0.085xI
1,, these numerical value are to calculate according to desirable smooth waveform.Unsmooth or level and smooth inadequately like waveform, considered amplitude more then is particularly for the situation (30 of 5 subharmonic ... 35% fundamental current).Be used to concentrated reactive power compensation with the three phase network of harmonic load.As select series reactor, make and have only a small amount of harmonic wave to get into the humorous compensating circuit of offset of reactance protection, i.e. " the humorous filter circuit of high offset ".Reaching of the offset filter circuit that is formed by reactor: according to specific power factor COS ∮, compensating power is avoided electrical network resonance.
Claims (3)
1. one kind is used for the current limliting of low-pressure system and the device of inhibition harmonic wave; Comprise rectifier (7); It is characterized in that: it also comprises the three-phase filter reactor (8) and compensation condenser (9) that has iron core and air-gap, and above-mentioned reactor (8) is connected with compensation condenser (9).
2. the current limliting and the device that suppresses harmonic wave that is used for low-pressure system as claimed in claim 1; It is characterized in that: the three-phase filter reactor (8) that has iron core and air-gap; Comprise iron core (1), winding (2), backing plate (3), seat formula installing rack (4) and three-phase terminal row (5), above-mentioned backing plate (3) is located between winding (2) and (1) unshakable in one's determination.
3. the current limliting and the device that suppresses harmonic wave that is used for low-pressure system as claimed in claim 2, it is characterized in that: above-mentioned iron core (1) is made up of laminated core module and insulating pad, and on the fixing present formula installing rack (4); Above-mentioned winding (2) adopts copper platinum or aluminium platinum, is provided with layer insulation therebetween, and its lead-in wire is connected with three-phase terminal row (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201867509U CN202602290U (en) | 2012-04-27 | 2012-04-27 | Current-limiting harmonic suppression device for low-voltage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201867509U CN202602290U (en) | 2012-04-27 | 2012-04-27 | Current-limiting harmonic suppression device for low-voltage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202602290U true CN202602290U (en) | 2012-12-12 |
Family
ID=47319806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201867509U Expired - Lifetime CN202602290U (en) | 2012-04-27 | 2012-04-27 | Current-limiting harmonic suppression device for low-voltage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202602290U (en) |
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2012
- 2012-04-27 CN CN2012201867509U patent/CN202602290U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
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| CX01 | Expiry of patent term |